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/* capture_dissectors.c
 * Routines for handling capture dissectors
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <glib.h>
#include <stdio.h>
#include <stdlib.h>
#include "packet.h"

#include "capture_dissectors.h"

struct capture_dissector_table {
    GHashTable *hash_table;
    const char *ui_name;
};

struct capture_dissector_handle
{
    guint32 pattern;
    capture_dissector_t dissector;
    protocol_t* protocol;
};

typedef struct capture_dissector_count
{
    guint32 count;
} capture_dissector_count_t;

static GHashTable *capture_dissector_tables = NULL;

static void
destroy_capture_dissector_table(void *data)
{
    struct capture_dissector_table *table = (struct capture_dissector_table *)data;

    g_hash_table_destroy(table->hash_table);
    g_free(data);
}

void capture_dissector_init(void)
{
    capture_dissector_tables = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, destroy_capture_dissector_table);
}

void capture_dissector_cleanup(void)
{
    g_hash_table_destroy(capture_dissector_tables);
}

void register_capture_dissector_table(const char *name, const char *ui_name)
{
    struct capture_dissector_table*     sub_dissectors;

    /* Make sure the registration is unique */
    if(g_hash_table_lookup( capture_dissector_tables, name )) {
        g_error("The capture dissector table %s (%s) is already registered - are you using a buggy plugin?", name, ui_name);
    }

    sub_dissectors = g_new(struct capture_dissector_table, 1);

    sub_dissectors->hash_table = g_hash_table_new_full( g_direct_hash, g_direct_equal, NULL, NULL );
    sub_dissectors->ui_name = ui_name;
    g_hash_table_insert( capture_dissector_tables, (gpointer)name, (gpointer) sub_dissectors );

}

void register_capture_dissector(const char* name, const guint32 pattern, capture_dissector_t dissector, const int proto)
{
    struct capture_dissector_table*     sub_dissectors;
    struct capture_dissector_handle *handle;

    /* Make sure table exists */
    sub_dissectors = (struct capture_dissector_table*)g_hash_table_lookup( capture_dissector_tables, name );
    if (sub_dissectors == NULL) {
            fprintf(stderr, "OOPS: Subdissector \"%s\" not found in capture_dissector_tables\n", name);
            if (getenv("WIRESHARK_ABORT_ON_DISSECTOR_BUG") != NULL)
                    abort();
            return;
    }
    g_assert(sub_dissectors != NULL);

    /* Make sure the registration is unique */
    g_assert(g_hash_table_lookup(sub_dissectors->hash_table, GUINT_TO_POINTER(pattern)) == NULL);

    handle                = wmem_new(wmem_epan_scope(), struct capture_dissector_handle);
    handle->pattern       = pattern;
    handle->dissector     = dissector;
    handle->protocol      = find_protocol_by_id(proto);

    g_hash_table_insert(sub_dissectors->hash_table, GUINT_TO_POINTER(pattern), (gpointer) handle);
}

gboolean try_capture_dissector(const char* name, const guint32 pattern, const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header)
{
    struct capture_dissector_table*     sub_dissectors;
    struct capture_dissector_handle* handle;

    sub_dissectors = (struct capture_dissector_table*)g_hash_table_lookup( capture_dissector_tables, name );
    if (sub_dissectors == NULL)
    {
        /* XXX - ASSERT? */
        return FALSE;
    }

    handle = (struct capture_dissector_handle *)g_hash_table_lookup(sub_dissectors->hash_table, GUINT_TO_POINTER(pattern));
    if (handle == NULL)
        return FALSE;

    return handle->dissector(pd, offset, len, cpinfo, pseudo_header);
}

guint32 capture_dissector_get_count(packet_counts* counts, const int proto)
{
    capture_dissector_count_t* hash_count = (capture_dissector_count_t*)g_hash_table_lookup(counts->counts_hash, GUINT_TO_POINTER(proto));
    if (hash_count == NULL)
        return 0;

    return hash_count->count;
}

void capture_dissector_increment_count(capture_packet_info_t *cpinfo, const int proto)
{
    /* See if we already have a counter for the protocol */
    capture_dissector_count_t* hash_count = (capture_dissector_count_t*)g_hash_table_lookup(cpinfo->counts, GUINT_TO_POINTER(proto));
    if (hash_count == NULL)
    {
        hash_count = g_new0(capture_dissector_count_t, 1);
        g_hash_table_insert(cpinfo->counts, GUINT_TO_POINTER(proto), (gpointer)hash_count);
    }

    hash_count->count++;
}

/*
 * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */